Sometimes old books fall apart when they are stored in air. Use what you know about the reactivity of elements to propose a way that old books could be kept from falling apart.

Transform each polar equation to an equation in rectangular coordinates. Then identify and graph the equation. $r \cos \theta=4$

Choose the letter that best answers the question or completes the statement. Copper is an example of a. an alkali metal. b. an alkaline earth metal. c. a nonmetal. d. a transition metal.

What can psychologists learn from conducting kinship studies?

Selected operating data for two divisions of Outback Brewing, Ltd., of Australia are given below:

$$\begin{matrix} \text{Division}\\ \text{ } & \text{Queensland} & \text{New South Wales}\\ \text{Sales} & \text{\$ 4.000.000} & \text{\$ 7.000.000}\\ \text{Average operating assets} & \text{\$ 2.000.000} & \text{\$ 2.000.000}\\ \text{Net operating income} & \text{\$ 360.000} & \text{\$ 420.000}\\ \text{Property, plant, and equipment (net)} & \text{\$ 950.000} & \text{\$ 800.000}\\ \end{matrix}$$

1. Compute the rate of return for each division using the return on investment (ROI) formula stated in terms of margin and turnover. 2. Which divisional manager seems to be doing the better job? Why?

How have changes in population growth affected demographics in Italy?

Check Understanding Explain why peer groups have a significant impact on individuals' political opinions.

Explain why giving away personal things might be a sign of someone considering suicide.

An element is a solid at room temperature. It can be a (1) metal only (2) metalloid only (3) metal or a nonmetal only (4) metal, a metalloid, or a nonmetal

If you know that an element is a solid at room temperature, do you have enough data to classify the element as a metal, metalloid, or nonmetal? If you know that the element is a gas at room temperature, do you have enough data? Explain your answers.

List three ways that the elements in the periodic table can be classified.

Find the matrix product. Note that each product can be found mentally, without the use of a calculator or pencil-and-paper calculations.

$$\left[\begin{array}{ll}{0} & {0} \\ {1} & {0}\end{array}\right]\left[\begin{array}{ll}{2} & {4} \\ {6} & {8}\end{array}\right]$$

What different systems of government did Sparta and Athens have?

Construct truth tables for this compound statement. Determine whether the statement is a. a tautology b. a contradiction c. neither. $(p \wedge q) \vee(p \wedge \neg r)$ $$ \begin{array}{|c|c|c|c|c|c|c|}\hline p & {q} & {r} & {\neg r} & {p \wedge q} & {p \wedge \neg r} & {(p \wedge q) \vee(p \wedge \neg r)} \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ &&&& \hline \\ \hline\end{array} $$